How can I clear my Apple Account balance to zero?
Change the region by zero the balance
[Re-Titled by Moderator]
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To clear your balance, buy something more expensive than your balance and pay the rest with a credit card or if you have less store credit than the cost of a single item and cannot add a credit card to your account, contact Apple Support so they can clear it.
Click the blue link above to have Apple support clear your balance.